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Finding the Fourth Proportional to 72,702.51, 100,329.90 and 40,871.13

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Solution

The fourth proportional to 72,702.51, 100,329.90 and 40,871.13 is: 56,402.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,702.51 : 100,329.90 = 40,871.13 : x
  2. Step 2: Convert to fraction form
    72,702.51/100,329.90 = 40,871.13/x
  3. Step 3: Cross multiply
    72,702.51x = 100,329.90 × 40,871.13
  4. Step 4: Simplify right side
    72,702.51x = 4,100,596,385.79
  5. Step 5: Solve for x
    x = 4,100,596,385.79/72,702.51
  6. Step 6: Final answer
    x = 56,402.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.